package org.example.common;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletInputStream;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;
    /**
     * 上传文件
     * @param file 参数名需要和前端请求名相同
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){


        //file
        String originalFilename=file.getOriginalFilename();
        log.info("图片名称:{}",originalFilename);
        String suffix=originalFilename.substring(originalFilename.lastIndexOf("."));
        String fileName= UUID.randomUUID().toString()+suffix;
        File dir=new File(basePath);
        if(!dir.exists()){
           dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            FileInputStream inputStream=new FileInputStream(new File(basePath+name));
            ServletOutputStream outputStream=response.getOutputStream();
            response.setContentType("image/jpeg");
            byte b[]=new byte[1024];
            int len=0;
            while((len = inputStream.read(b))!=-1){
                outputStream.write(b,0,len);
                outputStream.flush();
            }
            inputStream.close();
            outputStream.close();

        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
